Catheter



FIG. 1 is a perspective view of a catheter;

FIG. 2 is a front view thereof, the opposite side being a mirror image of the side shown herein;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a bottom view thereof.

The portion shown by broken lines is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a catheter, as shown and described. 